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ieee1394: fix to ether1394_tx in ether1394.c

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This patch fixes a problem that occurs when packets cannot be sent across
the ieee1394 bus and we return NETDEV_TX_BUSY in the net driver "hard start
xmit" routine ether1394_tx. When we return NETDEV_TX_BUSY the stack will
call ether1394_tx again with the same skb. So we need to restore the header
to look like it did before we munged it for xmit over ieee1394.

[Stefan Richter: changed whitespace, deleted a local variable]

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Carlos E. Ugarte 2007-06-04 11:49:19 -04:00 committed by Stefan Richter
parent a515958d6f
commit 18b461796b
1 changed files with 15 additions and 6 deletions
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21
drivers/ieee1394/eth1394.c
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@ -1565,7 +1565,7 @@ static void ether1394_complete_cb(void *__ptask)
/* Transmit a packet (called by kernel) */
static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
{
struct eth1394hdr *eth;
struct eth1394hdr hdr_buf;
struct eth1394_priv *priv = netdev_priv(dev);
__be16 proto;
unsigned long flags;
@ -1595,16 +1595,17 @@ static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
if (!skb)
goto fail;
/* Get rid of the fake eth1394 header, but save a pointer */
eth = (struct eth1394hdr *)skb->data;
/* Get rid of the fake eth1394 header, but first make a copy.
* We might need to rebuild the header on tx failure. */
memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
skb_pull(skb, ETH1394_HLEN);
proto = eth->h_proto;
proto = hdr_buf.h_proto;
dg_size = skb->len;
/* Set the transmission type for the packet. ARP packets and IP
* broadcast packets are sent via GASP. */
if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
if (memcmp(hdr_buf.h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
proto == htons(ETH_P_ARP) ||
(proto == htons(ETH_P_IP) &&
IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
@ -1616,7 +1617,7 @@ static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
priv->bc_dgl++;
} else {
__be64 guid = get_unaligned((u64 *)eth->h_dest);
__be64 guid = get_unaligned((u64 *)hdr_buf.h_dest);
node = eth1394_find_node_guid(&priv->ip_node_list,
be64_to_cpu(guid));
@ -1673,6 +1674,14 @@ static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
if (dest_node == (LOCAL_BUS | ALL_NODES))
goto fail;
/* At this point we want to restore the packet. When we return
* here with NETDEV_TX_BUSY we will get another entrance in this
* routine with the same skb and we need it to look the same.
* So we pull 4 more bytes, then build the header again. */
skb_pull(skb, 4);
ether1394_header(skb, dev, ntohs(hdr_buf.h_proto),
hdr_buf.h_dest, NULL, 0);
/* Most failures of ether1394_send_packet are recoverable. */
netif_stop_queue(dev);
priv->wake_node = dest_node;